The Ciise Muuse support was also in part due to UDUB being the party of Cigaal. Additionally, it was believed that Jaamac Cali Xuseen, a wealthy Ciise Muuse Citigroup banker, would be the next leader after Riyaale. As your map shows, the Sacad Muuse in Waqooyi Galbeed also voted in decent numbers for Riyaale.I looked it up.
A section of Sacad Musa in Hargeisa have supported Riyaale. His home base was Samaroon, HY and the powerful Cissa Musa in Berbera, his own VP.
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Riyaale had the full support of 2 Isaaq sub clans + Sameroon.
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Kahin is underrated. He played on the HY/HJ rift and appeased Cisse Musa to secure his presidency. He later used the same tactic on Dhulbahante pitting the Jamac Siyaad & Baharsame against the Ugadyahaan to capture Laascanood.
@Aden22 just doesn't want to accept reality, even when it is staring him in the face.